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• 视角与视力<br />
视角是指外界物体两端射向眼内的两条光线在<br />
结点处交叉所形成的角。<br />
视力就是眼睛能够分辨二物点间的最小距离的<br />
能力,以视角来衡量,与视细胞直径0.004mm一致,<br />
相当于1’视角。视角越小,视力越好。<br />
PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.cn<br />
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